Top

Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Key Features

  • 1.8V to 5.5V Input Voltage Range
  • Input Undervoltage Lockout
  • 0.5mA Quiescent Current
  • 640kHz/1.2MHz Current-Mode Step-Up Regulator
    • Fast Transient Response
    • High-Accuracy Output Voltage (1.5%)
    • Built-In 14V, 2.5A, 115mΩ MOSFET
    • High Efficiency
    • Programmable Soft-Start
    • Current Limit with Lossless Sensing
    • Timer-Delay Fault Latch
  • High-Speed Operational Amplifier
    • ±150mA Output Current
    • 7.5V/µs Slew Rate
    • 12MHz, -3dB Bandwidth
    • Rail-to-Rail Inputs/Outputs
  • Dual Mode™, Logic-Controlled, High-Voltage Switch with Programmable Delay
  • Thermal-Overload Protection
  • 24-Pin, 4mm x 4mm, Thin QFN Package

Applications/Uses

  • LCD Monitors
  • Notebook Displays

Description

The MAX8758 includes a high-performance step-up regulator, a high-speed operational amplifier, and a logic-controlled, high-voltage switch-control block with programmable delay. The device is optimized for thin-film transistor (TFT) liquid-crystal display (LCD) applications.

The step-up DC-DC regulator provides the regulated supply voltage for the panel source driver ICs. The converter is a high-frequency (640kHz/1.2MHz), current-mode regulator with an integrated 14V n-channel power MOSFET. The high-switching frequency allows the use of ultra-small inductors and ceramic capacitors. The current-mode control architecture provides fast transient response to pulsed loads. The regulator achieves efficiencies over 85% by bootstrapping the supply rail of the internal gate driver from the step-up regulator output. The step-up regulator features undervoltage lockout (UVLO), soft-start, and internal current limit. The high-current operational amplifier is designed to drive the LCD backplane (VCOM). The amplifier features high output current (±150mA), fast slew rate (7.5V/µs), wide bandwidth (12MHz), and rail-to-rail inputs and outputs.

The MAX8758 is available in a 24-pin, 4mm x 4mm, thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panels. The device operates over the -40°C to +85°C temperature range.

Simplified Block Diagram

MAX8758: Simplified Operating Circuit MAX8758: Simplified Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .